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Unread 10-01-2009, 10:13 PM   #1
uglyoldbob
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yj cad model

I started working on a 3d cad model (using the educational version of autodesk inventor) for the yj. Just started working of the frame today. I already have the commonly available "frame dimensions", but they only give some of the dimensions required. I am directly measuring frame dimensions off of a real yj to obtain the missing dimensions.

Remember that the drawings are not to scale. You cannot simply measure the number of pixels something on the drawing is and multiply it by a constant.

I would appreciate if somebody could help me verify these dimensions. Feel free to ask questions if you are unsure of what dimension is being specified.

Here are my measured dimensions (what I have so far).
Outside width of frame rail: 2.5"
Height of frame rail: 4"
Wall thickness of frame rail: 0.125"
Outside to outside frame width at front of frame: 33.125"
Diameter of front crossmember: 2.75"
Distance from center of front crossmember to front edge of frame: 2.25"
Distance from front edge of frame to edge of front crossmember: 0.875"
Distance from front of frame to the first horizontal bend: 54"
Distance from rear of frame to first horizontal bend: 56.5"
Distance from front of frame to rear of frame (exclude thickness of bumpers): 143"
Outside to outside width of frame at rear: 42.625"
Width of rear crossmember: 49.8125"

I still need to find the distance between the motor mount line and the front of the frame. That dimension is conveniently omitted from the technical drawing, and I don't have an easy way to measure it.

Next thing for the frame is to measure the vertical distances (side profile) of the frame, which will be much harder (but not impossible).

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Unread 10-04-2009, 08:36 PM   #2
uglyoldbob
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Is anybody interested at all?
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Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life. - Terry Pratchett.
Please browse my photography Use 10percentftw to recieve 10% off purchases.
1995 XJ, 6.2L, 700r4, 3.55 gears, 2wd (Still being built)
1994 YJ, 4.0L HO, AX15, np231, 31" tires, hardtop, 3.07 gears, trailmaster lift (4.5"?)
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Unread 10-04-2009, 09:21 PM   #3
Louie4
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I'm not trying to be funny, I'm just curious why you're modeling it? Class project?

I'm currently trying to get the FEA package and a workshop from a seller for Inventor 2010 for me and my company to use.
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Unread 10-04-2009, 09:40 PM   #4
NoahzArk
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What are you working on this for? Going to build something from scratch?

YJ Frame Dimensions
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Unread 10-04-2009, 10:25 PM   #5
uglyoldbob
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I am going to build and size all the required parts to put a 4bt into the yj. I figured somebody besides me should benefit from it. BTW I already have those drawings, they don't have all the information I need, which is why I needed to (and still have to) take some measurements directly off a YJ frame (of which I have 2 to measure).
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Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life. - Terry Pratchett.
Please browse my photography Use 10percentftw to recieve 10% off purchases.
1995 XJ, 6.2L, 700r4, 3.55 gears, 2wd (Still being built)
1994 YJ, 4.0L HO, AX15, np231, 31" tires, hardtop, 3.07 gears, trailmaster lift (4.5"?)
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Unread 10-05-2009, 01:42 PM   #6
USMC_JeepGuy
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Definately keep us posted on this! Along w/ pics or a link to the model when complete...
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Unread 10-05-2009, 01:52 PM   #7
John-Boy
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Do you have 2D views for AutoCAD '06, and are you willing to share?

Stuff like this makes fabrication WAY easier.
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Unread 10-05-2009, 05:14 PM   #8
uglyoldbob
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I can export to that format once I get more details into my model. Right now I have the basic frame shape and the front crossmember.
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Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life. - Terry Pratchett.
Please browse my photography Use 10percentftw to recieve 10% off purchases.
1995 XJ, 6.2L, 700r4, 3.55 gears, 2wd (Still being built)
1994 YJ, 4.0L HO, AX15, np231, 31" tires, hardtop, 3.07 gears, trailmaster lift (4.5"?)
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Unread 10-05-2009, 05:15 PM   #9
Louie4
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What version of Inventor are you using?
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Unread 10-05-2009, 05:35 PM   #10
uglyoldbob
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2010 Educational
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Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life. - Terry Pratchett.
Please browse my photography Use 10percentftw to recieve 10% off purchases.
1995 XJ, 6.2L, 700r4, 3.55 gears, 2wd (Still being built)
1994 YJ, 4.0L HO, AX15, np231, 31" tires, hardtop, 3.07 gears, trailmaster lift (4.5"?)
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Unread 10-05-2009, 05:40 PM   #11
Louie4
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If you don't mind, would you pm me the .ipt file to see how it looks. I'm not going to use it or anything. Just want to see the progress.
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Unread 10-05-2009, 05:52 PM   #12
uglyoldbob
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If you go here
(http://www.4btswaps.com/forum/showpost.php?p=82575&postcount=31)
You can see the model in pdf form. This forum won't let me add attachments or send attachments in messages.
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Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life. - Terry Pratchett.
Please browse my photography Use 10percentftw to recieve 10% off purchases.
1995 XJ, 6.2L, 700r4, 3.55 gears, 2wd (Still being built)
1994 YJ, 4.0L HO, AX15, np231, 31" tires, hardtop, 3.07 gears, trailmaster lift (4.5"?)
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Unread 10-06-2009, 12:23 AM   #13
gojeep91
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found this

I was looking around for some facts for my own Acad work and this tidbit. Only downfall is that it is all in millimeters, but the plus is its accurate as far as I can tell. YJ Frame Dimensions Enjoy!
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Unread 10-06-2009, 01:37 PM   #14
uglyoldbob
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I finished modeling the leaf springs and shackles. Moving on to the axles. I will model the axles I have (obviously), but not the internals. I need to measure the leaf height on the stock YJ.
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Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life. - Terry Pratchett.
Please browse my photography Use 10percentftw to recieve 10% off purchases.
1995 XJ, 6.2L, 700r4, 3.55 gears, 2wd (Still being built)
1994 YJ, 4.0L HO, AX15, np231, 31" tires, hardtop, 3.07 gears, trailmaster lift (4.5"?)
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Unread 10-06-2009, 02:29 PM   #15
Anonymous6915
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i would personally love if you wanted to send me a copy of the cad file. im an engineering student and sounds like this would come in handy when trying to build things...
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